Among my husband and his buddies, this movie is like Shakespeare -- they quote from it often and well, so often and well, in fact, that the quotes are just part of their vocabulary and the source is forgotten. It does have more than its share of witty quips, even for me, a lowly female ;).
I really do like this movie. It makes me miss the 80's, when it was still considered acceptable to be a patriotic American, and movies that glorified America and the military could be made without the felt need to apologize left and right. And of course Clint Eastwood is clever and attractive as always, as the hardcore Marine lifer who's trying to discover his tender side in time to reunite with his ex when he retires.